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<FONT color="green">001</FONT>    package org.hackystat.telemetry.analyzer.function.impl;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import org.hackystat.telemetry.analyzer.function.TelemetryFunction;<a name="line.3"></a>
<FONT color="green">004</FONT>    import org.hackystat.telemetry.analyzer.function.TelemetryFunctionException;<a name="line.4"></a>
<FONT color="green">005</FONT>    import org.hackystat.telemetry.analyzer.model.TelemetryStreamCollection;<a name="line.5"></a>
<FONT color="green">006</FONT>    <a name="line.6"></a>
<FONT color="green">007</FONT>    /**<a name="line.7"></a>
<FONT color="green">008</FONT>     * If passed two numbers, returns their product, and if passed two telemetry streams, returns a <a name="line.8"></a>
<FONT color="green">009</FONT>     * new TelemetryStreamCollection containing the pairwise multiplication of the individual elements. <a name="line.9"></a>
<FONT color="green">010</FONT>     * <a name="line.10"></a>
<FONT color="green">011</FONT>     * @author (Cedric) Qin ZHANG, Philip Johnson<a name="line.11"></a>
<FONT color="green">012</FONT>     */<a name="line.12"></a>
<FONT color="green">013</FONT>    public class MulFunction extends TelemetryFunction {<a name="line.13"></a>
<FONT color="green">014</FONT>    <a name="line.14"></a>
<FONT color="green">015</FONT>      /** Thread-safe mul operator. */<a name="line.15"></a>
<FONT color="green">016</FONT>      private MulOperator mulOperator = new MulOperator();<a name="line.16"></a>
<FONT color="green">017</FONT>      <a name="line.17"></a>
<FONT color="green">018</FONT>      /**<a name="line.18"></a>
<FONT color="green">019</FONT>       * Constructs this instance.<a name="line.19"></a>
<FONT color="green">020</FONT>       */<a name="line.20"></a>
<FONT color="green">021</FONT>      public MulFunction() {<a name="line.21"></a>
<FONT color="green">022</FONT>        super("mul");<a name="line.22"></a>
<FONT color="green">023</FONT>      }<a name="line.23"></a>
<FONT color="green">024</FONT>      <a name="line.24"></a>
<FONT color="green">025</FONT>      /**<a name="line.25"></a>
<FONT color="green">026</FONT>       * @param parameters An array of 2 objects of type either &lt;code&gt;Number&lt;/code&gt; <a name="line.26"></a>
<FONT color="green">027</FONT>       *        or &lt;code&gt;TelemetryStreamCollection&lt;/code&gt;. <a name="line.27"></a>
<FONT color="green">028</FONT>       * <a name="line.28"></a>
<FONT color="green">029</FONT>       * @return Either an instance of &lt;code&gt;Number&lt;/code&gt; or &lt;code&gt;TelemetryStreamCollection&lt;/code&gt;. <a name="line.29"></a>
<FONT color="green">030</FONT>       * @throws TelemetryFunctionException If anything is wrong.<a name="line.30"></a>
<FONT color="green">031</FONT>       */<a name="line.31"></a>
<FONT color="green">032</FONT>      @Override<a name="line.32"></a>
<FONT color="green">033</FONT>      public Object compute(Object[] parameters) throws TelemetryFunctionException {<a name="line.33"></a>
<FONT color="green">034</FONT>        //parameter validity check<a name="line.34"></a>
<FONT color="green">035</FONT>        if (parameters.length != 2 <a name="line.35"></a>
<FONT color="green">036</FONT>           || ! (parameters[0] instanceof Number || parameters[0] instanceof TelemetryStreamCollection)<a name="line.36"></a>
<FONT color="green">037</FONT>           || ! (parameters[1] instanceof Number || parameters[1] instanceof TelemetryStreamCollection)<a name="line.37"></a>
<FONT color="green">038</FONT>           ) {<a name="line.38"></a>
<FONT color="green">039</FONT>          throw new TelemetryFunctionException("Telemetry function " + this.getName()<a name="line.39"></a>
<FONT color="green">040</FONT>              + " takes 2 parameters of type 'Number' and/or 'TelemetryStreamCollection'.");<a name="line.40"></a>
<FONT color="green">041</FONT>        }<a name="line.41"></a>
<FONT color="green">042</FONT>        <a name="line.42"></a>
<FONT color="green">043</FONT>        if (parameters[0] instanceof Number &amp;&amp; parameters[1] instanceof Number) {<a name="line.43"></a>
<FONT color="green">044</FONT>          return this.mulOperator.computes((Number) parameters[0], (Number) parameters[1]);<a name="line.44"></a>
<FONT color="green">045</FONT>        }<a name="line.45"></a>
<FONT color="green">046</FONT>        else {<a name="line.46"></a>
<FONT color="green">047</FONT>          TelemetryStreamCollection tsc0 = (parameters[0] instanceof Number)<a name="line.47"></a>
<FONT color="green">048</FONT>            ? Utility.expandNumber((Number) parameters[0], (TelemetryStreamCollection) parameters[1])<a name="line.48"></a>
<FONT color="green">049</FONT>            : (TelemetryStreamCollection) parameters[0];<a name="line.49"></a>
<FONT color="green">050</FONT>          TelemetryStreamCollection tsc1 = (parameters[1] instanceof Number)<a name="line.50"></a>
<FONT color="green">051</FONT>            ? Utility.expandNumber((Number) parameters[1], (TelemetryStreamCollection) parameters[0])<a name="line.51"></a>
<FONT color="green">052</FONT>            : (TelemetryStreamCollection) parameters[1];<a name="line.52"></a>
<FONT color="green">053</FONT>          return BinaryOperationUtility.computes(this.mulOperator, tsc0, tsc1);<a name="line.53"></a>
<FONT color="green">054</FONT>        }<a name="line.54"></a>
<FONT color="green">055</FONT>      }<a name="line.55"></a>
<FONT color="green">056</FONT>    <a name="line.56"></a>
<FONT color="green">057</FONT>      /**<a name="line.57"></a>
<FONT color="green">058</FONT>       * Binary operator used by the enclosing class.<a name="line.58"></a>
<FONT color="green">059</FONT>       * <a name="line.59"></a>
<FONT color="green">060</FONT>       * @author (Cedric) Qin ZHANG<a name="line.60"></a>
<FONT color="green">061</FONT>       */<a name="line.61"></a>
<FONT color="green">062</FONT>      private static class MulOperator implements BinaryOperationUtility.BinaryOperator {<a name="line.62"></a>
<FONT color="green">063</FONT>        /**<a name="line.63"></a>
<FONT color="green">064</FONT>         * Performs binary operation. <a name="line.64"></a>
<FONT color="green">065</FONT>         * @param a Number 1.<a name="line.65"></a>
<FONT color="green">066</FONT>         * @param b Number 2.<a name="line.66"></a>
<FONT color="green">067</FONT>         * @return The result.<a name="line.67"></a>
<FONT color="green">068</FONT>         */<a name="line.68"></a>
<FONT color="green">069</FONT>        public Number computes(Number a, Number b) {<a name="line.69"></a>
<FONT color="green">070</FONT>          if (a instanceof Integer &amp;&amp; b instanceof Integer) {<a name="line.70"></a>
<FONT color="green">071</FONT>            return Integer.valueOf(a.intValue() * b.intValue());<a name="line.71"></a>
<FONT color="green">072</FONT>          }<a name="line.72"></a>
<FONT color="green">073</FONT>          else {<a name="line.73"></a>
<FONT color="green">074</FONT>            return Double.valueOf(a.doubleValue() * b.doubleValue());<a name="line.74"></a>
<FONT color="green">075</FONT>          }      <a name="line.75"></a>
<FONT color="green">076</FONT>        }<a name="line.76"></a>
<FONT color="green">077</FONT>      }<a name="line.77"></a>
<FONT color="green">078</FONT>    }<a name="line.78"></a>




























































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